If you seriously think China is communist these days, you haven't heard of Deng Xioping's maxim, "To get rich is glorious". Secondly, as for the slavery - you have totally failed to prove a direct link between free trade and slavery. In fact, let's put it this way - if countries cannot participate in the world trading system, are marginalised and poor, they are more likely to have slavery or extremist governments: countries with outright slavery like Niger and Mauritania have no economy and little trade to speak of. Countries with truly operating communism like North Korea have policies you would like - Kim Il-Sung committed them to a policy called "juche", which means "self-reliance". They shut out the world. And look where it got them.
Ivan
Why don't you explain to us what "multilateral trade" is.
AS for "free trade" link to slavery? When did the American people lose their right to NOT trade with a nation that engages in slavery? When the WTO was created.